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Milani SZ, Rezabakhsh A, Karimipour M, Salimi L, Mardi N, Narmi MT, Sadeghsoltani F, Valioglu F, Rahbarghazi R. Role of autophagy in angiogenic potential of vascular pericytes. Front Cell Dev Biol 2024; 12:1347857. [PMID: 38380339 PMCID: PMC10877016 DOI: 10.3389/fcell.2024.1347857] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2023] [Accepted: 01/24/2024] [Indexed: 02/22/2024] Open
Abstract
The vasculature system is composed of a multiplicity of juxtaposed cells to generate a functional biological barrier between the blood and tissues. On the luminal surface of blood vessels, endothelial cells (ECs) are in close contact with circulating cells while supporting basal lamina and pericytes wrap the abluminal surface. Thus, the reciprocal interaction of pericytes with ECs is a vital element in the physiological activity of the vascular system. Several reports have indicated that the occurrence of pericyte dysfunction under ischemic and degenerative conditions results in varied micro and macro-vascular complications. Emerging evidence points to the fact that autophagy, a conserved self-digestive cell machinery, can regulate the activity of several cells like pericytes in response to various stresses and pathological conditions. Here, we aim to highlight the role of autophagic response in pericyte activity and angiogenesis potential following different pathological conditions.
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Affiliation(s)
- Soheil Zamen Milani
- Student Research Committee, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Aysa Rezabakhsh
- Cardiovascular Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Mohammad Karimipour
- Stem Cell Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Leila Salimi
- Stem Cell Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Narges Mardi
- Biotechnology Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | | | | | - Ferzane Valioglu
- Technology Development Zones Management CO., Sakarya University, Sakarya, Türkiye
| | - Reza Rahbarghazi
- Stem Cell Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
- Department of Applied Cellular Sciences, Faculty of Advanced Medical Sciences, Tabriz University of Medical Sciences, Tabriz, Iran
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2
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Jeong E, Willett R, Rissone A, La Spina M, Puertollano R. TMEM55B links autophagy flux, lysosomal repair, and TFE3 activation in response to oxidative stress. Nat Commun 2024; 15:93. [PMID: 38168055 PMCID: PMC10761734 DOI: 10.1038/s41467-023-44316-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2023] [Accepted: 12/07/2023] [Indexed: 01/05/2024] Open
Abstract
Lysosomes have emerged as critical regulators of cellular homeostasis. Here we show that the lysosomal protein TMEM55B contributes to restore cellular homeostasis in response to oxidative stress by three different mechanisms: (1) TMEM55B mediates NEDD4-dependent PLEKHM1 ubiquitination, causing PLEKHM1 proteasomal degradation and halting autophagosome/lysosome fusion; (2) TMEM55B promotes recruitment of components of the ESCRT machinery to lysosomal membranes to stimulate lysosomal repair; and (3) TMEM55B sequesters the FLCN/FNIP complex to facilitate translocation of the transcription factor TFE3 to the nucleus, allowing expression of transcriptional programs that enable cellular adaptation to stress. Knockout of tmem55 genes in zebrafish embryos increases their susceptibility to oxidative stress, causing early death of tmem55-KO animals in response to arsenite toxicity. Altogether, our work identifies a role for TMEM55B as a molecular sensor that coordinates autophagosome degradation, lysosomal repair, and activation of stress responses.
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Affiliation(s)
- Eutteum Jeong
- Cell and Developmental Biology Center, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD, USA
| | - Rose Willett
- Cell and Developmental Biology Center, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD, USA
| | - Alberto Rissone
- Cell and Developmental Biology Center, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD, USA
| | - Martina La Spina
- Cell and Developmental Biology Center, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD, USA
| | - Rosa Puertollano
- Cell and Developmental Biology Center, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD, USA.
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3
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Hejazian SM, Ardalan M, Hosseiniyan Khatibi SM, Rahbar Saadat Y, Barzegari A, Gueguen V, Meddahi-Pellé A, Anagnostou F, Zununi Vahed S, Pavon-Djavid G. Biofactors regulating mitochondrial function and dynamics in podocytes and podocytopathies. J Cell Physiol 2023; 238:2206-2227. [PMID: 37659096 DOI: 10.1002/jcp.31110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2023] [Revised: 06/25/2023] [Accepted: 08/14/2023] [Indexed: 09/04/2023]
Abstract
Podocytes are terminally differentiated kidney cells acting as the main gatekeepers of the glomerular filtration barrier; hence, inhibiting proteinuria. Podocytopathies are classified as kidney diseases caused by podocyte damage. Different genetic and environmental risk factors can cause podocyte damage and death. Recent evidence shows that mitochondrial dysfunction also contributes to podocyte damage. Understanding alterations in mitochondrial metabolism and function in podocytopathies and whether altered mitochondrial homeostasis/dynamics is a cause or effect of podocyte damage are issues that need in-depth studies. This review highlights the roles of mitochondria and their bioenergetics in podocytes. Then, factors/signalings that regulate mitochondria in podocytes are discussed. After that, the role of mitochondrial dysfunction is reviewed in podocyte injury and the development of different podocytopathies. Finally, the mitochondrial therapeutic targets are considered.
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Affiliation(s)
| | | | | | | | - Abolfazl Barzegari
- Université Sorbonne Paris Nord, INSERM U1148, Laboratory for Vascular Translational Science, Cardiovascular Bioengineering, Villetaneuse, France
| | - Virginie Gueguen
- Université Sorbonne Paris Nord, INSERM U1148, Laboratory for Vascular Translational Science, Cardiovascular Bioengineering, Villetaneuse, France
| | - Anne Meddahi-Pellé
- Université Sorbonne Paris Nord, INSERM U1148, Laboratory for Vascular Translational Science, Cardiovascular Bioengineering, Villetaneuse, France
| | - Fani Anagnostou
- Université de Paris, CNRS UMR 7052 INSERM U1271, B3OA, Paris, France
| | | | - Graciela Pavon-Djavid
- Université Sorbonne Paris Nord, INSERM U1148, Laboratory for Vascular Translational Science, Cardiovascular Bioengineering, Villetaneuse, France
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4
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Baek J, Lee YH, Jeong HY, Lee SY. Mitochondrial quality control and its emerging role in the pathogenesis of diabetic kidney disease. Kidney Res Clin Pract 2023; 42:546-560. [PMID: 37448292 PMCID: PMC10565453 DOI: 10.23876/j.krcp.22.233] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2022] [Revised: 01/10/2023] [Accepted: 01/17/2023] [Indexed: 07/15/2023] Open
Abstract
Most eukaryotic cells have mitochondrial networks that can change in shape, distribution, and size depending on cellular metabolic demands and environments. Mitochondrial quality control is critical for various mitochondrial functions including energy production, redox homeostasis, intracellular calcium handling, cell differentiation, proliferation, and cell death. Quality control mechanisms within mitochondria consist of antioxidant defenses, protein quality control, DNA damage repair systems, mitochondrial fusion and fission, mitophagy, and mitochondrial biogenesis. Defects in mitochondrial quality control and disruption of mitochondrial homeostasis are common characteristics of various kidney cell types under hyperglycemic conditions. Such defects contribute to diabetes-induced pathologies in renal tubular cells, podocytes, endothelial cells, and immune cells. In this review, we focus on the roles of mitochondrial quality control in diabetic kidney disease pathogenesis and discuss current research evidence and future directions.
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Affiliation(s)
- Jihyun Baek
- Division of Nephrology, Department of Internal Medicine, CHA Bundang Medical Center, CHA University, Seongnam, Republic of Korea
- Department of Biomedical Science, College of Life Science, CHA University, Pocheon, Republic of Korea
| | - Yu Ho Lee
- Division of Nephrology, Department of Internal Medicine, CHA Bundang Medical Center, CHA University, Seongnam, Republic of Korea
| | - Hye Yun Jeong
- Division of Nephrology, Department of Internal Medicine, CHA Bundang Medical Center, CHA University, Seongnam, Republic of Korea
| | - So-Young Lee
- Division of Nephrology, Department of Internal Medicine, CHA Bundang Medical Center, CHA University, Seongnam, Republic of Korea
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5
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Zhong JB, Yao YF, Zeng GQ, Zhang Y, Ye BK, Dou XY, Cai L. A closer association between blood urea nitrogen and the probability of diabetic retinopathy in patients with shorter type 2 diabetes duration. Sci Rep 2023; 13:9881. [PMID: 37336896 DOI: 10.1038/s41598-023-35653-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2023] [Accepted: 05/22/2023] [Indexed: 06/21/2023] Open
Abstract
Blood urea nitrogen (BUN) is an indicator of renal function and catabolic status in human body. Diabetic retinopathy (DR) is a major microvascular complication of diabetes mellitus (DM) and a serious threat to the vision of diabetic patients. We included 426 type 2 diabetic patients who visited the endocrinology department of Guangdong Provincial People's Hospital and received an ophthalmology consultation from December 2017 to November 2018. The outcome was the probability of DR in participants. Multivariable logistics analysis was used to confirm the relationship between BUN and the probability of DR. And interaction tests were conducted to find the effects of DM duration on their association. A total of 167 of 426 patients with type 2 diabetes had DR, with a probability of 39.20%. After adjusting for potential confounders, a positive association between BUN and the probability of DR (OR = 1.12; 95% CI 1.03-1.21; P = 0.0107). And a test for interaction between DM duration and BUN on the probability of DR was significant (P = 0.0295). We suggested that in patients with type 2 diabetes, BUN was positively associated with the probability of DR and the association was influenced by DM duration.
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Affiliation(s)
- Jian-Bo Zhong
- Department of Ophthalmology, Shenzhen University General Hospital, Shenzhen, Guangdong Province, China
- Shenzhen University Medical College, No. 3688 Nanhai Ave, Shenzhen, 518061, Guangdong Province, China
| | - Yu-Feng Yao
- Department of Ophthalmology, Shenzhen Second People's Hospital, The First Affiliated Hospital of Shenzhen University, Shenzhen, Guangdong Province, China
- Shantou University Medical College, No. 22 Xinling Road, Shantou, 515031, Guangdong Province, China
| | - Guo-Qiang Zeng
- Department of Ophthalmology, Shenzhen University General Hospital, Shenzhen, Guangdong Province, China
- Shenzhen University Medical College, No. 3688 Nanhai Ave, Shenzhen, 518061, Guangdong Province, China
| | - Yi Zhang
- Department of Ophthalmology, Shenzhen University General Hospital, Shenzhen, Guangdong Province, China
| | - Bai-Kang Ye
- Department of Ophthalmology, Shenzhen Second People's Hospital, The First Affiliated Hospital of Shenzhen University, Shenzhen, Guangdong Province, China
- Shantou University Medical College, No. 22 Xinling Road, Shantou, 515031, Guangdong Province, China
| | - Xiao-Yan Dou
- Department of Ophthalmology, Shenzhen Second People's Hospital, The First Affiliated Hospital of Shenzhen University, Shenzhen, Guangdong Province, China.
| | - Li Cai
- Department of Ophthalmology, Shenzhen University General Hospital, Shenzhen, Guangdong Province, China.
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6
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Romanova N, Schmitz J, Strakeljahn M, Grünberger A, Bahnemann J, Noll T. Single-Cell Analysis of CHO Cells Reveals Clonal Heterogeneity in Hyperosmolality-Induced Stress Response. Cells 2022; 11:cells11111763. [PMID: 35681457 PMCID: PMC9179406 DOI: 10.3390/cells11111763] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2022] [Revised: 05/18/2022] [Accepted: 05/23/2022] [Indexed: 02/04/2023] Open
Abstract
Hyperosmolality can occur during industrial fed-batch cultivation processes of Chinese hamster ovary (CHO) cells as highly concentrated feed and base solutions are added to replenish nutrients and regulate pH values. Some effects of hyperosmolality, such as increased cell size and growth inhibition, have been elucidated by previous research, but the impact of hyperosmolality and the specific effects of the added osmotic-active reagents have rarely been disentangled. In this study, CHO cells were exposed to four osmotic conditions between 300 mOsm/kg (physiologic condition) and 530 mOsm/kg (extreme hyperosmolality) caused by the addition of either high-glucose-supplemented industrial feed or mannitol as an osmotic control. We present novel single-cell cultivation data revealing heterogeneity in mass gain and cell division in response to these treatments. Exposure to extreme mannitol-induced hyperosmolality and to high-glucose-oversupplemented feed causes cell cycle termination, mtDNA damage, and mitochondrial membrane depolarization, which hints at the onset of premature stress-induced senescence. Thus, this study shows that both mannitol-induced hyperosmolality (530 mOsm/kg) and glucose overfeeding induce severe negative effects on cell growth and mitochondrial activity; therefore, they need to be considered during process development for commercial production.
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Affiliation(s)
- Nadiya Romanova
- Cell Culture Technology, Faculty of Technology, Bielefeld University, 33615 Bielefeld, Germany; (M.S.); (T.N.)
- Correspondence: ; Tel.: +49-521-106-6324
| | - Julian Schmitz
- Multiscale Bioengineering, Faculty of Technology, Bielefeld University, 33615 Bielefeld, Germany; (J.S.); (A.G.)
| | - Marie Strakeljahn
- Cell Culture Technology, Faculty of Technology, Bielefeld University, 33615 Bielefeld, Germany; (M.S.); (T.N.)
| | - Alexander Grünberger
- Multiscale Bioengineering, Faculty of Technology, Bielefeld University, 33615 Bielefeld, Germany; (J.S.); (A.G.)
| | - Janina Bahnemann
- Institute of Physics, University of Augsburg, 86159 Augsburg, Germany;
| | - Thomas Noll
- Cell Culture Technology, Faculty of Technology, Bielefeld University, 33615 Bielefeld, Germany; (M.S.); (T.N.)
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7
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Liu S, Yuan Y, Xue Y, Xing C, Zhang B. Podocyte Injury in Diabetic Kidney Disease: A Focus on Mitochondrial Dysfunction. Front Cell Dev Biol 2022; 10:832887. [PMID: 35321238 PMCID: PMC8935076 DOI: 10.3389/fcell.2022.832887] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2021] [Accepted: 02/07/2022] [Indexed: 12/18/2022] Open
Abstract
Podocytes are a crucial cellular component in maintaining the glomerular filtration barrier, and their injury is the major determinant in the development of albuminuria and diabetic kidney disease (DKD). Podocytes are rich in mitochondria and heavily dependent on them for energy to maintain normal functions. Emerging evidence suggests that mitochondrial dysfunction is a key driver in the pathogenesis of podocyte injury in DKD. Impairment of mitochondrial function results in an energy crisis, oxidative stress, inflammation, and cell death. In this review, we summarize the recent advances in the molecular mechanisms that cause mitochondrial damage and illustrate the impact of mitochondrial injury on podocytes. The related mitochondrial pathways involved in podocyte injury in DKD include mitochondrial dynamics and mitophagy, mitochondrial biogenesis, mitochondrial oxidative phosphorylation and oxidative stress, and mitochondrial protein quality control. Furthermore, we discuss the role of mitochondria-associated membranes (MAMs) formation, which is intimately linked with mitochondrial function in podocytes. Finally, we examine the experimental evidence exploring the targeting of podocyte mitochondrial function for treating DKD and conclude with a discussion of potential directions for future research in the field of mitochondrial dysfunction in podocytes in DKD.
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Affiliation(s)
- Simeng Liu
- Department of Nephrology, The First Affiliated Hospital of Nanjing Medical University, Nanjing Medical University, Nanjing, China
| | - Yanggang Yuan
- Department of Nephrology, The First Affiliated Hospital of Nanjing Medical University, Nanjing Medical University, Nanjing, China
| | - Yi Xue
- Suzhou Hospital of Integrated Traditional Chinese and Western Medicine, Suzhou, China
| | - Changying Xing
- Department of Nephrology, The First Affiliated Hospital of Nanjing Medical University, Nanjing Medical University, Nanjing, China
- *Correspondence: Changying Xing, ; Bo Zhang,
| | - Bo Zhang
- Department of Nephrology, The First Affiliated Hospital of Nanjing Medical University, Nanjing Medical University, Nanjing, China
- Department of Nephrology, Pukou Branch of JiangSu Province Hospital (Nanjing Pukou Central Hospital), Nanjing, China
- *Correspondence: Changying Xing, ; Bo Zhang,
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8
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Lakpa KL, Khan N, Afghah Z, Chen X, Geiger JD. Lysosomal Stress Response (LSR): Physiological Importance and Pathological Relevance. J Neuroimmune Pharmacol 2021; 16:219-237. [PMID: 33751445 PMCID: PMC8099033 DOI: 10.1007/s11481-021-09990-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2020] [Accepted: 03/08/2021] [Indexed: 02/08/2023]
Abstract
Extensive work has characterized endoplasmic reticulum (ER) and mitochondrial stress responses. In contrast, very little has been published about stress responses in lysosomes; subcellular acidic organelles that are physiologically important and are of pathological relevance. The greater lysosomal system is dynamic and is comprised of endosomes, lysosomes, multivesicular bodies, autophagosomes, and autophagolysosomes. They are important regulators of cellular physiology, they represent about 5% of the total cellular volume, they are heterogeneous in their sizes and distribution patterns, they are electron dense, and their subcellular positioning within cells varies in response to stimuli, insults and pH. These organelles are also integral to the pathogenesis of lysosomal storage diseases and it is increasingly recognized that lysosomes play important roles in the pathogenesis of such diverse conditions as neurodegenerative disorders and cancer. The purpose of this review is to focus attention on lysosomal stress responses (LSR), compare LSR with better characterized stress responses in ER and mitochondria, and form a framework for future characterizations of LSR. We synthesized data into the concept of LSR and present it here such that the definition of LSR can be modified as new knowledge is added and specific therapeutics are developed.
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Affiliation(s)
- Koffi L Lakpa
- Department of Biomedical Sciences, Dakota School of Medicine and Health Sciences, University of North, Grand Forks, ND, 58203, USA
| | - Nabab Khan
- Department of Biomedical Sciences, Dakota School of Medicine and Health Sciences, University of North, Grand Forks, ND, 58203, USA
| | - Zahra Afghah
- Department of Biomedical Sciences, Dakota School of Medicine and Health Sciences, University of North, Grand Forks, ND, 58203, USA
| | - Xuesong Chen
- Department of Biomedical Sciences, Dakota School of Medicine and Health Sciences, University of North, Grand Forks, ND, 58203, USA
| | - Jonathan D Geiger
- Department of Biomedical Sciences, Dakota School of Medicine and Health Sciences, University of North, Grand Forks, ND, 58203, USA.
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9
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Mutlu B, Puigserver P. GCN5 acetyltransferase in cellular energetic and metabolic processes. BIOCHIMICA ET BIOPHYSICA ACTA. GENE REGULATORY MECHANISMS 2021; 1864:194626. [PMID: 32827753 PMCID: PMC7854474 DOI: 10.1016/j.bbagrm.2020.194626] [Citation(s) in RCA: 42] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2020] [Revised: 07/29/2020] [Accepted: 08/14/2020] [Indexed: 12/23/2022]
Abstract
General Control Non-repressed 5 protein (GCN5), encoded by the mammalian gene Kat2a, is the first histone acetyltransferase discovered to link histone acetylation to transcriptional activation [1]. The enzymatic activity of GCN5 is linked to cellular metabolic and energetic states regulating gene expression programs. GCN5 has a major impact on energy metabolism by i) sensing acetyl-CoA, a central metabolite and substrate of the GCN5 catalytic reaction, and ii) acetylating proteins such as PGC-1α, a transcriptional coactivator that controls genes linked to energy metabolism and mitochondrial biogenesis. PGC-1α is biochemically associated with the GCN5 protein complex during active metabolic reprogramming. In the first part of the review, we examine how metabolism can change GCN5-dependent histone acetylation to regulate gene expression to adapt cells. In the second part, we summarize the GCN5 function as a nutrient sensor, focusing on non-histone protein acetylation, mainly the metabolic role of PGC-1α acetylation across different tissues.
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Affiliation(s)
- Beste Mutlu
- Department of Cancer Biology, Dana-Farber Cancer Institute, Boston, MA, USA; Department of Cell Biology, Harvard Medical School, Boston, MA, USA
| | - Pere Puigserver
- Department of Cancer Biology, Dana-Farber Cancer Institute, Boston, MA, USA; Department of Cell Biology, Harvard Medical School, Boston, MA, USA.
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10
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He M, Li Y, Wang L, Guo B, Mei W, Zhu B, Zhang J, Ding Y, Meng B, Zhang L, Xiang L, Dong J, Liu M, Xiang L, Xiang G. MYDGF attenuates podocyte injury and proteinuria by activating Akt/BAD signal pathway in mice with diabetic kidney disease. Diabetologia 2020; 63:1916-1931. [PMID: 32588068 DOI: 10.1007/s00125-020-05197-2] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/23/2019] [Accepted: 04/27/2020] [Indexed: 12/14/2022]
Abstract
AIMS/HYPOTHESIS Myeloid-derived growth factor (MYDGF), mainly secreted by bone marrow-derived cells, has been known to promote glucagon-like peptide-1 production and improve glucose/lipid metabolism in mouse models of diabetes, but little is known about the functions of MYDGF in diabetic kidney disease (DKD). Here, we investigated whether MYDGF can prevent the progression of DKD. METHODS In vivo experiments, both loss- and gain-of-function strategies were used to evaluate the effect of MYDGF on albuminuria and pathological glomerular lesions. We used streptozotocin-treated Mydgf knockout and wild-type mice on high fat diets to induce a model of DKD. Then, albuminuria, glomerular lesions and podocyte injury were evaluated in Mydgf knockout and wild-type DKD mice treated with adeno-associated virus-mediated Mydgf gene transfer. In vitro and ex vivo experiments, the expression of slit diaphragm protein nephrin and podocyte apoptosis were evaluated in conditionally immortalised mouse podocytes and isolated glomeruli from non-diabetic wild-type mice treated with recombinant MYDGF. RESULTS MYDGF deficiency caused more severe podocyte injury in DKD mice, including the disruption of slit diaphragm proteins (nephrin and podocin) and an increase in desmin expression and podocyte apoptosis, and subsequently caused more severe glomerular injury and increased albuminuria by 39.6% compared with those of wild-type DKD mice (p < 0.01). Inversely, MYDGF replenishment attenuated podocyte and glomerular injury in both wild-type and Mydgf knockout DKD mice and then decreased albuminuria by 36.7% in wild-type DKD mice (p < 0.01) and 34.9% in Mydgf knockout DKD mice (p < 0.01). Moreover, recombinant MYDGF preserved nephrin expression and inhibited podocyte apoptosis in vitro and ex vivo. Mechanistically, the renoprotection of MYDGF was attributed to the activation of the Akt/Bcl-2-associated death promoter (BAD) pathway. CONCLUSIONS/INTERPRETATION The study demonstrates that MYDGF protects podocytes from injury and prevents the progression of DKD, providing a novel strategy for the treatment of DKD. Graphical abstract.
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Affiliation(s)
- Mingjuan He
- The First School of Clinical Medicine, Southern Medical University, Guangzhou, Guangdong Province, China
- Department of Endocrinology, General Hospital of Central Theater Command, Wuluo Road 627, Wuhan, 430070, Hubei Province, China
- Department of Endocrinology, Wuhan Fourth Hospital, Puai Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei Province, China
| | - Yixiang Li
- Department of Hematology and Medical Oncology, School of Medicine, Emory University, Atlanta, GA, USA
| | - Li Wang
- The First School of Clinical Medicine, Southern Medical University, Guangzhou, Guangdong Province, China
- Department of Endocrinology, General Hospital of Central Theater Command, Wuluo Road 627, Wuhan, 430070, Hubei Province, China
| | - Bei Guo
- The First School of Clinical Medicine, Southern Medical University, Guangzhou, Guangdong Province, China
- Department of Endocrinology, General Hospital of Central Theater Command, Wuluo Road 627, Wuhan, 430070, Hubei Province, China
| | - Wen Mei
- Department of Endocrinology, General Hospital of Central Theater Command, Wuluo Road 627, Wuhan, 430070, Hubei Province, China
| | - Biao Zhu
- Department of Endocrinology, General Hospital of Central Theater Command, Wuluo Road 627, Wuhan, 430070, Hubei Province, China
| | - Jiajia Zhang
- Department of Endocrinology, General Hospital of Central Theater Command, Wuluo Road 627, Wuhan, 430070, Hubei Province, China
| | - Yan Ding
- The First School of Clinical Medicine, Southern Medical University, Guangzhou, Guangdong Province, China
- Department of Endocrinology, General Hospital of Central Theater Command, Wuluo Road 627, Wuhan, 430070, Hubei Province, China
| | - Biying Meng
- The First School of Clinical Medicine, Southern Medical University, Guangzhou, Guangdong Province, China
- Department of Endocrinology, General Hospital of Central Theater Command, Wuluo Road 627, Wuhan, 430070, Hubei Province, China
| | - Liming Zhang
- The First School of Clinical Medicine, Southern Medical University, Guangzhou, Guangdong Province, China
- Department of Endocrinology, General Hospital of Central Theater Command, Wuluo Road 627, Wuhan, 430070, Hubei Province, China
| | - Lin Xiang
- Department of Endocrinology, General Hospital of Central Theater Command, Wuluo Road 627, Wuhan, 430070, Hubei Province, China
| | - Jing Dong
- Department of Endocrinology, General Hospital of Central Theater Command, Wuluo Road 627, Wuhan, 430070, Hubei Province, China
| | - Min Liu
- Department of Endocrinology, General Hospital of Central Theater Command, Wuluo Road 627, Wuhan, 430070, Hubei Province, China
| | - Lingwei Xiang
- ICF, 2635 Century Pkwy NE Unit 1000, Atlanta, GA, 30345, USA.
| | - Guangda Xiang
- The First School of Clinical Medicine, Southern Medical University, Guangzhou, Guangdong Province, China.
- Department of Endocrinology, General Hospital of Central Theater Command, Wuluo Road 627, Wuhan, 430070, Hubei Province, China.
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11
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Zheng HJ, Zhang X, Guo J, Zhang W, Ai S, Zhang F, Wang Y, Liu WJ. Lysosomal dysfunction-induced autophagic stress in diabetic kidney disease. J Cell Mol Med 2020; 24:8276-8290. [PMID: 32583573 PMCID: PMC7412686 DOI: 10.1111/jcmm.15301] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2020] [Revised: 03/26/2020] [Accepted: 04/02/2020] [Indexed: 12/14/2022] Open
Abstract
The catabolic process that delivers cytoplasmic constituents to the lysosome for degradation, known as autophagy, is thought to act as a cytoprotective mechanism in response to stress or as a pathogenic process contributing towards cell death. Animal and human studies have shown that autophagy is substantially dysregulated in renal cells in diabetes, suggesting that activating autophagy could be a therapeutic intervention. However, under prolonged hyperglycaemia with impaired lysosome function, increased autophagy induction that exceeds the degradative capacity in cells could contribute toward autophagic stress or even the stagnation of autophagy, leading to renal cytotoxicity. Since lysosomal function is likely key to linking the dual cytoprotective and cytotoxic actions of autophagy, it is important to develop novel pharmacological agents that improve lysosomal function and restore autophagic flux. In this review, we first provide an overview of the autophagic-lysosomal pathway, particularly focusing on stages of lysosomal degradation during autophagy. Then, we discuss the role of adaptive autophagy and autophagic stress based on lysosomal function. More importantly, we focus on the role of autophagic stress induced by lysosomal dysfunction according to the pathogenic factors (including high glucose, advanced glycation end products (AGEs), urinary protein, excessive reactive oxygen species (ROS) and lipid overload) in diabetic kidney disease (DKD), respectively. Finally, therapeutic possibilities aimed at lysosomal restoration in DKD are introduced.
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Affiliation(s)
- Hui Juan Zheng
- Renal Research Institution of Beijing University of Chinese Medicine, Beijing, China.,Key Laboratory of Chinese Internal Medicine of Ministry of Education and Beijing, Dongzhimen Hospital Affiliated to Beijing University of Chinese Medicine, Beijing, China
| | - Xueqin Zhang
- Renal Research Institution of Beijing University of Chinese Medicine, Beijing, China.,Key Laboratory of Chinese Internal Medicine of Ministry of Education and Beijing, Dongzhimen Hospital Affiliated to Beijing University of Chinese Medicine, Beijing, China
| | - Jing Guo
- Renal Research Institution of Beijing University of Chinese Medicine, Beijing, China.,Key Laboratory of Chinese Internal Medicine of Ministry of Education and Beijing, Dongzhimen Hospital Affiliated to Beijing University of Chinese Medicine, Beijing, China
| | - Wenting Zhang
- Renal Research Institution of Beijing University of Chinese Medicine, Beijing, China.,Key Laboratory of Chinese Internal Medicine of Ministry of Education and Beijing, Dongzhimen Hospital Affiliated to Beijing University of Chinese Medicine, Beijing, China
| | - Sinan Ai
- Renal Research Institution of Beijing University of Chinese Medicine, Beijing, China.,Key Laboratory of Chinese Internal Medicine of Ministry of Education and Beijing, Dongzhimen Hospital Affiliated to Beijing University of Chinese Medicine, Beijing, China
| | - Fan Zhang
- Renal Research Institution of Beijing University of Chinese Medicine, Beijing, China.,Key Laboratory of Chinese Internal Medicine of Ministry of Education and Beijing, Dongzhimen Hospital Affiliated to Beijing University of Chinese Medicine, Beijing, China
| | - Yaoxian Wang
- Renal Research Institution of Beijing University of Chinese Medicine, Beijing, China.,Key Laboratory of Chinese Internal Medicine of Ministry of Education and Beijing, Dongzhimen Hospital Affiliated to Beijing University of Chinese Medicine, Beijing, China
| | - Wei Jing Liu
- Renal Research Institution of Beijing University of Chinese Medicine, Beijing, China.,Key Laboratory of Chinese Internal Medicine of Ministry of Education and Beijing, Dongzhimen Hospital Affiliated to Beijing University of Chinese Medicine, Beijing, China.,Institute of Nephrology, and Zhanjiang Key Laboratory of Prevention and Management of Chronic Kidney Disease, Guangdong Medical University, Zhanjiang, China
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